KOKO\Mimi
350 lines
5.6 KiB
Markdown
350 lines
5.6 KiB
Markdown
<!-- source-page: 241 -->
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If automatic time incrementation is not selected in the analysis procedure, values of PNEWDT that are greater than 1.0 will be ignored and values of PNEWDT that are less than 1.0 will cause the job to terminate.
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# ENER
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Energy per unit mass stored in the fluid. This variable is used for energy output only and has no effect on the solution.
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# Variables passed in for information
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# PRESS
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Fluid cavity pressure at the end of the increment. For a linear perturbation step this is the base state pressure.
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# DPRESS
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Fluid cavity pressure increment. For a linear perturbation step this value is zero.
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# PRESSI
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Fluid cavity pressure at the beginning of the analysis.
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# TEMP
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Fluid cavity temperature at the end of the increment. For a linear perturbation step this is the base state temperature.
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# DTEMP
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Fluid cavity temperature increment. For a linear perturbation step this value is zero.
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# TEMPI
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Fluid cavity temperature at the beginning of the analysis.
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# TIME(1)
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Current value of step time at the start of the increment.
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# TIME(2)
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Current value of total time at the start of the increment.
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# DTIME
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Time increment.
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# KSTEP
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Step number.
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# KINC
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Increment number.
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# NONUM
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Cavity reference node number.
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<!-- source-page: 242 -->
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# FLNAME
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User-specified fluid property name, left justified.
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# LFLAG
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Linear perturbation flag for the step. If this is a linear perturbation step, LFLAG=1. For a general analysis step LFLAG=0.
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<!-- source-page: 243 -->
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# 1.1.34 UFLUIDCONNECTORLOSS: User subroutine to define the loss coefficient for fluid flow in fluid pipe connector elements.
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Product: Abaqus/Standard
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# Reference
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• \*FLUID PIPE CONNECTOR LOSS
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# Overview
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User subroutine UFLUIDCONNECTORLOSS:
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• can be used to define the loss coefficient in a fluid pipe connector element;
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• corresponds to the Darcy-Weisbach equation for pressure loss; and
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• can be used with the fluid pipe connector elements.
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# User subroutine interface
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```txt
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subroutine ufluidconnectorloss (
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C Write only -
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* ak1, ak2,
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C Read only -
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* coords, flow, rho, visc,
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* dia, area,
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* ndim, jelno, kStep, kInc,
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* time,
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* nIarray,
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* i_array,
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* nRarray,
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* r_array,
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* ncarray,
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* c_array)
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C
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include 'aba_param.inc'
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C
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dimension time(2),
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* coords(2*ndim),
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* i_array(nIarray),
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* r_array(nRarray)
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C
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character*80 c_array(ncarray)
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```
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<!-- source-page: 244 -->
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C
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```lua
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user coding to define connector friction values
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return
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end
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```
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# Variables to be defined
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ak1
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This connector loss coefficient must be updated and is used when the flow is from node 1 to node 2.
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ak2
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This connector loss coefficient must be updated and is used when the flow is from node 2 to node 1.
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# Variables passed in for information
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coords(2\*ndim)
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Array containing original coordinates of the element. coords(1:ndim) is the coordinate of the first node, and coords(ndim+1:2\*ndim) is the coordinate of the second node.
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flow
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Current flow rate through the element.
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rho
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Current density of fluid flowing through the pipe.
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visc
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Current viscosity of fluid flowing through the pipe.
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dia
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User-specified hydraulic diameter.
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area
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User-specified hydraulic area.
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ndim
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Dimension of the element.
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jelno
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User element number for which friction coefficient is required.
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kStep
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Step number.
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kInc
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Increment number.
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<!-- source-page: 245 -->
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time(1)
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Current step time.
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time(2)
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Total time.
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nIarray
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Size of array i\_array.
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i\_array
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Integer array for future expansion.
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nRarray
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Size of array r\_array.
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r\_array
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Real array for future expansion.
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ncarray
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Size of array c\_array.
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c\_array
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Character array for future expansion.
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<!-- source-page: 246 -->
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<!-- source-page: 247 -->
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# 1.1.35 UFLUIDCONNECTORVALVE: User subroutine to define the valve opening to control flow in fluid pipe connector elements.
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Product: Abaqus/Standard
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# Reference
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• \*FLUID PIPE CONNECTOR LOSS
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# Overview
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User subroutine UFLUIDCONNECTORVALVE:
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• can be used to control the valve opening to turn off or turn on fluid flow; and
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• can be used with fluid pipe connector elements.
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# User subroutine interface
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```txt
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subroutine ufluidconnectorvalve (
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C Write only -
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* valveOpening,
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C Read only -
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* coords, flow, rho, visc,
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* dia, area,
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* ndim, jelno, kStep, kInc,
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* time,
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* nIarray,
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* i_array,
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* nRarray,
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* r_array,
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* ncarray,
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* c_array)
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C
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include 'aba_param.inc'
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C
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dimension time(2),
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* coords(2*ndim),
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* i_array(nIarray),
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* r_array(nRarray)
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C
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character*80 c_array(ncarray)
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C
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```
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<!-- source-page: 248 -->
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```lua
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user coding to define control valve opening
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return
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end
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```
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# Variable to be defined
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valveOpening
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The value of this variable must be set between 0.0 (closed/shut-off) and 1.0 (fully open) to determine whether the valve is fully or partially open or closed.
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# Variables passed in for information
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coords(2\*ndim)
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Array containing the original coordinates of the element. acoords(1:ndim) is the coordinate of the first node, and acoords(ndim+1:2\*ndim) is the coordinate of the second node.
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flow
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Current flow rate through the element.
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rho
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Current density of fluid flowing through the pipe.
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visc
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Current viscosity of fluid flowing through the pipe.
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dia
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User-specified hydraulic diameter.
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area
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User-specified hydraulic area.
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ndim
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Dimension of the element.
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jelno
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User element number for which a friction coefficient is required.
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kStep
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Step number.
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kInc
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Increment number.
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time(1)
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Current step time.
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<!-- source-page: 249 -->
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time(2)
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Total time.
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nIarray
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Size of array i\_array.
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i\_array
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Integer array for future expansion.
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nRarray
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Size of array r\_array.
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r\_array
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Real array for future expansion.
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ncarray
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Size of array c\_array.
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c\_array
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Character array for future expansion.
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<!-- source-page: 250 -->
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